Who said "The thing is, it's really hard to concentrate."?

This quote is attributed to Holden Caulfield.

The thing is, it's really hard to concentrate. - Holden Caulfield

"The thing is, it's really hard to concentrate."

Holden Caulfield Education

Character in The Catcher in the Rye

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"It kills me. It really does."

"I'm the most terrific liar you ever saw in your life."

"Phoniness kills me. It really does."

"I really do. That's the thing about me. I'm quite the sexfiend."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."